Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Hypothesized stimulus classes arising from the reinforced sample-comparison combinations in hue-form symbolic, form-hue symbolic, and form-identity successive matching. R = red, G = green, T = triangle, H = horizontal, 1 = first temporal position within a matching trial, 2 = second temporal position within a matching trial.
